Removal of siloxanes in biogases.

Journal of hazardous materials (2001-05-12)
M Schweigkofler, R Niessner
RESUMEN

Methods for the removal of gaseous silicon compounds in biogases are presented. In laboratory studies, various solid adsorption materials and liquid absorption solutions were evaluated for their siloxane elimination efficiencies. Among the liquid sorbents studied, concentrated nitric acid and sulfuric acid were found to be especially potent siloxane removing agents at elevated temperature. Solid adsorbents tested include activated charcoal, carbopack B, Tenax TA, XAD II resins, molecular sieve 13X and silica gel. Apart from activated charcoal, silica gel showed especially high adsorption capacities of more than 100mg/g for siloxanes. Furthermore, excellent thermal regeneration of the loaded material was possible. The efficiency of silica gel in removing gaseous siloxanes was verified at a sewage treatment plant, where an adsorption bed with silica gel was used for biogas drying. Other gas pretreatment installations studied included refrigeration condensers and adsorbent beds of meadow ore for the catalytic removal of hydrogen sulfide. In contrast to biogas drying by refrigeration, which had a poor effect on siloxane content, the installation of meadow ore adsorption beds resulted in a significant siloxane reduction of 31-75%, depending on the site studied.

MATERIALES
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Supelco
Nitric acid concentrate, 0.1 M HNO3 in water (0.1N), eluent concentrate for IC
Supelco
Carbopack Adsorbent, matrix Carbopack B, 60-80 mesh, bottle of 10 g
Supelco
Carbopack Adsorbent, matrix Carbopack C, 80-100 mesh, bottle of 10 g
Supelco
Molecular Sieve Adsorbent, matrix Molecular Sieve 13X, 45-60 mesh, bottle of 50 g
Supelco
Molecular Sieve Adsorbent, matrix Molecular Sieve 13X, 100-120 mesh, bottle of 50 g
Supelco
Carbopack Adsorbent, matrix Carbopack C, 60-80 mesh, bottle of 10 g
Supelco
Carbopack Adsorbent, matrix Carbopack Z, 60-80 mesh, bottle of 10 g
Supelco
Carbopack Adsorbent, matrix Carbopack X, 40-60 mesh, bottle of 10 g
Supelco
Carbopack Adsorbent, matrix Carbopack X, 60-80 mesh, bottle of 10 g
Supelco
Carbopack X, glass TD tube, fritted, O.D. × L 1/4 in. × 3 1/2 in., preconditioned, pkg of 10 ea
Supelco
Carbopack Adsorbent, matrix Carbopack X, 120-400 mesh, bottle of 50 g
Supelco
Carbopack X, O.D. × L 1/4 in. × 3 1/2 in., glass TD tube, fritted, Sealed with Brass Endcaps, preconditioned, pkg of 10 ea
Supelco
Carbopack Adsorbent, matrix Carbopack Y, 40-60 mesh, bottle of 10 g
Supelco
FLM Carbopack X Deactivated Stainless Steel TD Tube, preconditioned, pkg of 10 tubes, O.D. × L 1/4 in. (6.35 mm) × 3 1/2 in. (89 mm)
Supelco
Carbopack Adsorbent, matrix Carbopack Y, 120-400 mesh, bottle of 50 g
Supelco
Carbopack B, glass TD tube, fritted, O.D. × L 1/4 in. × 3 1/2 in., preconditioned, pkg of 10 ea
Supelco
Carbopack B, glass TD tube, fritted, O.D. × L 1/4 in. × 3 1/2 in., unconditioned, pkg of 10 ea, matrix Carbopack
Supelco
Carbopack B, stainless steel TD tube, O.D. × L 1/4 × 3 1/2, unconditioned, pkg of 10 ea
Supelco
Carbopack B, O.D. × L 1/4 in. × 3 1/2 in., glass TD tube, fritted, Sealed with Brass Endcaps, preconditioned, pkg of 10 ea
Supelco
Metal Packed GC Column (General Configuration), phase none, matrix 45/60 Molecular Sieve 13X support, L × O.D. × I.D. 10.0 ft (3.0 m) × 1/8  in. × 2.1 mm